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Fit PC—A Tiny Linux PC that Fits Anywhere

"The fit-PC is priced at $285, which includes the hard drive and
pre-loaded Linux OS. While you can build a PC that's nearly as
inexpensive, or buy a used laptop for not much more, the fit-PC's
unique form factor gives it an edge in any environment where space
is at a premium. Also, its extremely low power usage means you can
keep the system running all the time."